Timezone Converter: Convert Time Between Timezones | Free Tool

A It runs entirely in your browser, but you need internet to load the page initially. Once loaded, the timezone data stays cached in memory for the session. The conversion itself happens client-side, not on a server. If your internet drops while using it, the tool keeps working until you refresh the page. That's handy on shaky hotel Wi-Fi or during flights with spotty coverage.

A Yes, absolutely. Two cities might share the same standard offset but switch DST on different dates. For example, New York and Santiago both use UTC-5 in winter, but Chile shifts in September while the US shifts in March. Our tool handles this because it uses the IANA timezone database, which tracks each region's specific rules. Just pick the exact city or region name, not just the offset. Double-check your results around the spring and fall transition weeks.

A Pick a major city in the same timezone instead. For instance, if you need Porto and it's not listed, choose Lisbon — they're both in Western European Time. The dropdown covers 45+ zones but skips smaller towns. Another option: use the UTC offset closest to your target. London matches UTC+0, Berlin fits UTC+1. Still unsure? Check the country's official IANA timezone name and match it manually.

A Yes, it does. The IANA timezone database tracks each region's DST rules separately. Melbourne shifts in October, London shifts in March. Those two are months apart. When you convert between them around those weeks, the tool automatically adjusts. I've seen people trip up assuming DST is universal. It's not. A practical example: converting from New York to Sydney in late March will show a 16-hour difference, not 14. That's because Sydney already switched back while New York hasn't yet. Always check the specific date, not just the time.

A Yes, but only if you pick the exact city or region name, not just the UTC offset. The tool pulls DST rules straight from the IANA database, so converting New York to Berlin in late March will show 6 hours difference, not the usual 5. That's because the US switches earlier than Europe. If you pick a generic offset instead of a city, you'll get a wrong result around transition weeks. My tip: always select a named location and double check meetings scheduled near DST shifts.

A Countries like the US, Canada, and Brazil span multiple timezones. Converting New York to Los Angeles is 3 hours, but New York to Chicago is only 1. The tool uses the IANA database, so it reads each city's exact zone. If you pick a generic country option, it defaults to the capital. That's why New York to Dallas might show 2 hours. Always type the city name, not the country. For example, São Paulo and Manaus are an hour apart, so check the dropdown before trusting the result.

A That's almost certainly daylight saving time kicking in. The tool uses your browser's IANA timezone data, so it knows when each region springs forward or falls back. But here's the catch: if you're viewing a cached result from before a DST transition, the display won't refresh until you re-run the conversion. Try clearing the fields and re-entering the date. For example, converting London to New York on March 10th versus March 9th, 2025, will show five or four hours respectively. Practical tip: always re-convert meetings that straddle a DST change, never trust an old result.

A They won't, because this is purely a web-based calculation tool rather than a native device clock. When you click the swap button to reverse New York and Tokyo, the conversion updates instantly on screen. But your phone or computer alarm stays locked to your local system time. Set manual reminders in your calendar app after converting if you're coordinating early morning calls across 13-hour gaps.

A The interface displays two columns for a direct comparison, but you can easily reset the target city to check a third region within seconds. For instance, comparing London and New York might leave you wondering about Tokyo. Just click the dropdown on the right side and pick Japan Standard Time. The numbers update instantly without reloading the entire page. A fast workflow helps when juggling remote teams across Europe, the US, and Asia simultaneously.

A You don't need a login because the tool remembers your recent conversions directly in your browser's local storage. When you frequently check London and Sydney, those two cities stay pinned at the top of the dropdown for your next visit. We don't track your searches or require passwords. Clear your browser cache, though, and those saved pairs will vanish. Bookmark the URL if you want a permanent shortcut.